Self defense, stopping power, and caliber, Part 6

Tuesday, April 29, 2008 Filed in: Ammunition, General gun stuff, Techniques & Training

(For convenience, you can access all the installments of this series at this link.)

"What would I want with a reputation? That's a good way to get yourself killed!" - Jason McCullough, "Support Your Local Sheriff" (my favorite movie of all time!)

What about "reputation"? Some cartridges or loadings have reputations for better effectiveness than others. Sometimes that's valid, but other times it may not be.

Let's take the mighty .357 Magnum, one of my very favorite cartridges. The 125 grain semi-jacketed hollowpoint loads have the reputation of being superbly effective; some believe that they are the "best" manstoppers ever made. I've talked with people who have actually used them in real shootings, and they were very happy with the performance. But there are instances of stupendous failures.

For those who hold that energy is everything, this may come as a shock. How could all that power possibly fail? Simple - if it doesn't do both of the Twin Tasks!

Let's consider what happens with the 125 grain Magnum loads. Leaving the barrel at nearly 1500 feet per second, the bullet enters the target with a huge reserve of energy. As the hollowpoint fills with fluid and starts to expand, it uses up some of that energy to grow dramatically in diameter. The increase in diameter means more resistance in the tissues, which uses more energy and further slows the bullet. Because the relatively light weight of the slug doesn't have great momentum, and thus not a lot of stored energy, it doesn't travel very far before it finally runs out of steam. The result can be a shallow wound - one which doesn't reach something the body finds important.

This is the "ugly secret" that proponents of the .357 125 grain JHP don't want to talk about. Shallow wound profiles with these "barn burner" loads are not unheard of, and occasionally prove to not be as effective as expected. As one noted trainer once told me, when they work they are superb - but when they fail, they fail spectacularly!

Suppose you've decided that you'd prefer something a bit more predictable, but want to retain the superb performance of the round - is there a solution? Yep! Simply go to a slightly heavier bullet, one which carries a tad less velocity and a bit more momentum. Winchester, for instance, has the 145 grain Silvertip bullet, and Speer is now making a 135 grain Gold Dot Magnum load. Both are obviously designed to retain the Magnum's reputation as a fight-ender, but do so on a more consistent basis.

This is a good illustration of the tradeoffs involved in cartridge selection. Speed isn't everything; bullet size isn't everything; bullet weight isn't everything. It's a combination, a concert of all of those (plus good handling qualities as defined by the shooter) that make a round effective. One can't simply say "I've got a Magnum" or "I carry a .45" and smugly claim that one has the "perfect" self defense gun. While it may work, there is always the chance that it may not; handguns, after all, are underpowered things.

Through intelligent selection, you can dramatically improve the performance envelope of your chosen gun, regardless of the cartridge it shoots.

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-=[ Grant ]=-

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